Dissertation > Excellent graduate degree dissertation topics show

Nano- ZnO / PS composites and its photocatalytic properties

Author: RanDeChao
Tutor: FuMin
School: Chongqing Technology and Business University
Course: Environmental Engineering
Keywords: Nano-ZnO Polystyrene Composite Self-degradation
CLC: TB332
Type: Master's thesis
Year: 2010
Downloads: 82
Quote: 0
Read: Download Dissertation

Abstract

At present, the inorganic nanoparticle composites of organic polymers has become a hotspot at home and abroad, that take full advantage of the special nature of the inorganic nano-particles to organic polymers to improve and enhance the physical and chemical properties.The paper perpared nano ZnO/PS composite materials used nano-ZnO and organic polymers polystyrene (PS). The photocatalytic degradation of PS was improved by using the photocatalytic oxidation of nano-ZnO. The nano-ZnO can only be used Less than 368.8nm UV range since the band gap was 3.37eV.So that it is necessary to carry out its doping, reduce its band gap and increase its range of light use.This experiment studied the following three aspects(1) Study on the photo-catalytic performance of nano-ZnO/PS powder. We found that the best reaction condition for nano-ZnO:PS was 1:1, calcinations temperature was 300℃, baking time was 0.5h, which degradation rate of methyl orange was 17.2% higher than pure ZnO was 8% under the same conditions, 5 hours, visible lights. The SEM image showed that nano-ZnO was coated by a bit of organic polymer, which enhances the dispersion of nano-ZnO. However, under the condition of the sample in the UV-5h of methyl orange degradation rate is lower than pure nano-ZnO. Composite powder by the photo catalytic reaction kinetics study found that nano-ZnO and composite materials in the visible or ultraviolet light under the conditions of the degradation of methyl orange are in line with a kinetic equation.(2) Composite film prepared by blending nano-ZnO and polystyrene (PS) at high speed mixing that results in self-degradation under UV light was investigated in this study. Analysis indicates that after adding the coupling agent KH570, nano-ZnO and PS were linked together through chemical bonding. The TG spectra showed that ZnO/PS composite films has higher heat resistant than pure PS. Also, SEM images indicated that 0.5wt% nano-ZnO were evenly distributed in the PS membrane, however, light corrosion appeared on the membrane surface after UV irradiation. The UV irradiation experiments showed that for a 0.5wt% ZnO/PS composite film, after 15 days at a UV irradiation power of 15W, the degradation degree increased to 3.7150%.(3) Nano-ZnO particles doped with Fe were prepared by means of Sol-Gel from zinc acetate dehydrate and nine water-ferric nitrate. The Fe/ZnO/PS films were prepared by the way of solution high blending. Though the analysis of IR, TG, UV-Vis and fluorescence spectra to explain its structure. Finally, the thin film under UV light degradation have been studied and found that the best self-degradation of nano Fe/ZnO/PS film was4.7363%,was 1.0213%higher than nano-ZnO/PS film under the same condition of 15w UV lamp,15 days.

Related Dissertations

CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Composite materials > Non-metallic composite materials
© 2012 www.DissertationTopic.Net Mobile